4 Commits

Author	SHA1	Message	Date
Virgil Dupras	495d2819d2	recipes/rc2014/sdcard: make spi relay design multi-devices ... Also, fix the SPI relay driver to properly AND-away the result of the CTL read. Tested with a real prototype, works fine.	2020-09-18 19:22:56 -04:00
Virgil Dupras	1a6a549857	Make the SPI Relay protocol support multiple devices ... Working on programming AVR chips exposes a glaring omission in my first design of the SPI Relay: not allowing multiple devices make this task hard. I constantly have to unplug my SD card before, plug the AVR chip holder, then play a bit, then unplug the AVR holder, then replug the SD card... My prototype for a SPI relay design is built, but I haven't tested it yet. I need to adapt the code first, which is what I do here. When the prototype is tested, I'll update the SDC recipe with a new schema.	2020-09-17 09:48:55 -04:00
Virgil Dupras	46676547d9	spi: add SPI_DELAY decl ... AVR chips often run at less than z80's system clock. This means that our SPI relay needs to have its own clock to properly communicate with it. This means that the delay between OUT and IN can't be hardcoded to 2 NOPs anymore. It needs to be configurable.	2020-08-23 07:55:17 -04:00
Virgil Dupras	f09aa0603c	rc2014: separate SPI relay and SDC drivers ... My intention is to reuse the SPI relay to program AVR MCUs from a RC2014.	2020-06-29 18:48:00 -04:00